minimum preparation depth of 2.5mm minimum cavity width of 2mm divergent proximal boxes bucco-lingual width of proximal boxes at least 3.5m round internal angles. Cavity preparations were done under rubber dam with a diamond bur (100micron) with high-speed handpiece, in case of carious tissue this was removed finely. After finishing, all cavities were cleaned with air-water spray and gently air-dried in order to apply 37% phosphoric acid etchant gel on enamel and dentin. The cavities were then rinsed for 30 s with air-water spray and dried using suction to keep some moisture in dentin and a layer of bonding is applied onto the surface and light-cured. Composite material was applied in the cavities in order to create a block-out, that will eliminate undercuts and increase thickness of residual walls.